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  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      function sayHi() {
        console.log(this.name);
      }
      sayHi.test = 5;

      // 返回值只克隆函数不会克隆对象
      let bound = sayHi.bind({
        name: "John",
      });
      console.log(bound.test); //undefined
    </script>
  </body>
</html>
